diff --git a/docs/06-advanced-options.md b/docs/06-advanced-options.md
index edc78be..9ec6e37 100644
--- a/docs/06-advanced-options.md
+++ b/docs/06-advanced-options.md
@@ -234,7 +234,7 @@ Use this option to handle hardlinks (only works on Linux/OSX). The `first` optio
 
 ### ignore-filenames
 `--ignore-filenames`  
-Use this option to set a filename, or list of filenames, that indicate exclusion of a folder which contains it. A common use would be to have a file named something like ".nobackup" and place this file into folders that should not be backed up.
+Use this option to set a filename, or list of filenames, that indicate exclusion of a folder which contains it. A common use would be to have a file named something like ".nobackup" and place this file into folders that should not be backed up. The Separtor is for Windows systems the semicolon (;) and on Linux systems the colon (:).
 
 ### include
 `--include`